I didn't say that quote, that was input_sh. Please pay more attention to people, especially if you're going to be calling out sources for information.
> It's also not clear for how long this policy was in place if it was.
It's consistent with what has been observed all throughout this war--Israel has had rather looser rules of engagement than many people would expect, and that has had the rather predictable effect of rather high incidents of accidents, such as Israeli soldiers killing 3 of the hostages or the attack on the aid convoy.
> This is a question of proportionality in the laws of war sense of the word. I.e. what collateral damage is acceptable when attacking an enemy combatant. If that statement you refer to is factual, which we don't know, it means that strikes against combatants are approved up this threshold.
20 civilian combatants for 1 enemy combatant is a pretty high threshold, especially for low-level members. According to an Economist article I read, that's the level the US is comfortable with only for essentially enemy heads of state (think Saddam Hussein or Osama bin Laden). (Reportedly, Israel feels 1:100 is acceptable in this kind of scenario.)
> It's almost certainly not reflecting the total civilian to combatant ratio.
No, it's not. But it's evidence that Israel isn't doing a good job of minimizing civilian casualties. And the actual numbers we have here aren't good. In the best case scenario (taking Israel's probably somewhat-inflated figures for combatants killed and the lowest numbers of civilians killed), it's about 1 combatant to 2 civilians, roughly comparable to the war in Donbass before Russia invaded Ukraine for reals (we don't have good estimates post 2022 because Russia hasn't released anything in the areas it occupies). I suspect the real numbers are probably closer to 1-to-4. By contrast, the US-led battles of Fallujah and Mosul--both urban fights against terrorist-held cities--had casualty rates around (and perhaps better than) 1-to-1.
I wouldn't be so incensed about this if Israeli generals weren't prancing around boasting that no one has done as good a job as Israel has in minimizing civilian casualties when it is so transparently false.